Primare AB • Renvägen 1 • SE - 35245 Växjö • Sweden • Tel +46 470 729215 • www.primare.net
P
R
I
M
A
R
E
REVIEW: I22 INTEGRATED AMPLIFIER AND CD22 CD PLAYER
Technology By Image
Internal View of the CD22
01
R-Core transformer for powering the digital audio stages, analogue audio and mechanics
02
Switch-mode power supply for the processor level, monitoring and display
03
Three different power supplies for analogue audio, digital audio and mechanics
04
Filtering by 4 2200µF/50V capacitors plus three 2200µF/35V capacitors, and three chokes
(inductors)
05
Regulation of power supplies by circuits mounted on heat sinks
06
'Hi-fi' player system (and not computer CD-Rom) from Asatech with Sanyo optical block
07
Digital signal processor card
08
Management and mechanical control circuits and signal extracted from the block with
Mitsumi MM1669 circuit and Servo Toshiba circuit TC94 series including a buffer level of 5
seconds. The data from the player or the USB are stored in memory and then extracted at
a hyper-regular rate with an ultra-precise clock circuit. This fully asynchronous mode of
operation largely eliminates the jitter and compensates for possible playback defects
associated with shock (lack of data from the block after a shock)
09
TMP92 32-bit microcontroller with USB interface for conversion to SPDIF
10
Digital / analogue management card. The signals (SPDIF in symmetric AES / EBU form)
pass through a galvanic isolation micro-transformer
11
STC LE5204 microcontroller
12
Burr-Brown SRC4392 sampling frequency converter circuit. It can work up to a frequency
of 216kHz (192 kHz in the Primare). The working frequency (ie sampling of the signal) can
be chosen by the user: 44.1 kHz (bypass), 48 kHz, 96 kHz or 192 kHz
13
'DAC' Burr Brown PCM1792 converter, Delta Sigma, 24 bits / 192 kHz
14
Current-voltage conversion and analogue outputs with operational amplifiers (OPA134)
and discrete components (Mosfet transistors, current source). There is no capacitor in the
signal path.
